:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #ef4444;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--text-main);
}

header p {
    color: var(--text-muted);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 768px) {
    .calculator-grid {
        grid-template-columns: 450px 1fr;
    }
}

.card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-main);
    border-left: 4px solid var(--primary-color);
    padding-left: 8px;
}

.input-group {
    margin-bottom: 24px;
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.group-header h3 {
    margin-bottom: 0;
}

.field {
    margin-bottom: 16px;
}

.field .label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.field label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0;
    color: var(--text-muted);
}

.estimate-hint {
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 500;
}

.field input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.field input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

.hidden {
    display: none;
}

.reset-btn {
    width: 100%;
    padding: 12px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-muted);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.reset-btn:hover {
    background-color: #f1f5f9;
    color: var(--text-main);
}

/* Results */
.result-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.warning {
    background-color: #fef2f2;
    color: var(--warning-color);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #fee2e2;
    font-size: 0.875rem;
    text-align: center;
}

.result-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

@media (min-width: 1024px) {
    .result-cards {
        grid-template-columns: 1fr 1fr;
    }
}

.result-card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.card-tag {
    position: absolute;
    top: 0;
    right: 0;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    border-bottom-left-radius: 12px;
}

.base .card-tag { background-color: var(--text-muted); }
.leverage .card-tag { background-color: var(--success-color); }

.result-card h3 {
    border: none;
    padding: 0;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
}

.result-item span {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.result-item strong {
    color: var(--text-main);
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 16px 0;
}

.result-item.highlight span {
    color: var(--text-main);
    font-weight: 600;
}

.result-item.highlight strong {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.percent {
    font-family: 'Courier New', Courier, monospace;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: var(--text-muted);
    font-size: 0.875rem;
}